Say for example when you press a button on the form, windows sends a message to your windows procedure that eventually hidden from the user. Whenever you perform any task in window, it gets executed by giving one or more calls to windows API. NET we can call Win 32 API using platform Interop Services, which resides at namespace. Other languages just act as a shell to provide an automated and easier way to access APIs. It is something like the native code of Windows. Every user action causes the execution of several or more API function telling Windows what's happened. Now you might have question in your mind that What is API?ĪPI (Application Program Interface) is a set of predefined Windows functions used to control the appearance and behavior of every Windows element (from the outlook of the desktop window to the allocation of memory for a new process). Using these API you can perform direct operation in windows, which increases performance of your application. Windows exposes lots of functionality in the form of Win32 API.
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